// Instantiate Presentation class that represents the PPTX
Presentation pres = new Presentation();

//Get the first slide
ISlide sld = (ISlide)pres.getSlides().get_Item(0);

//Add an AutoShape of Rectangle type
IAutoShape ashp = sld.getShapes().addAutoShape(ShapeType.Rectangle, 150, 75, 150, 50);

//Add ITextFrame to the Rectangle
ashp.addTextFrame("Hello World");

// Where will we save our new .ppxt?
String outputfilepath = dataPath + "Pptx4jHelloWorld.pptx";
if (MACRO_ENABLE) outputfilepath += "m";

// Create skeletal package, including a MainPresentationPart and a SlideLayoutPart
PresentationMLPackage presentationMLPackage = PresentationMLPackage.createPackage(); 

if (MACRO_ENABLE) {
    ContentTypeManager ctm = presentationMLPackage.getContentTypeManager();
    ctm.removeContentType(new PartName("/ppt/presentation.xml") );
    ctm.addOverrideContentType(new URI("/ppt/presentation.xml"), ContentTypes.PRESENTATIONML_MACROENABLED);
}

// Need references to these parts to create a slide
// Please note that these parts *already exist* - they are
// created by createPackage() above.  See that method
// for instruction on how to create and add a part.
MainPresentationPart pp = (MainPresentationPart)presentationMLPackage.getParts().getParts().get(
        new PartName("/ppt/presentation.xml"));     
SlideLayoutPart layoutPart = (SlideLayoutPart)presentationMLPackage.getParts().getParts().get(
        new PartName("/ppt/slideLayouts/slideLayout1.xml"));

// OK, now we can create a slide
SlidePart slidePart = new SlidePart(new PartName("/ppt/slides/slide1.xml"));
slidePart.setContents( SlidePart.createSld() );     
pp.addSlide(0, slidePart);

// Slide layout part
slidePart.addTargetPart(layoutPart);


// Create and add shape
Shape sample = ((Shape)XmlUtils.unmarshalString(SAMPLE_SHAPE, Context.jcPML) );
slidePart.getContents().getCSld().getSpTree().getSpOrGrpSpOrGraphicFrame().add(sample);